the world > the earth > water > flow or flowing > change in level of water > [adjective] > increased or increasing (3)
Of the level of a body of water, esp. the tide or floodwater: increasing in height. Also in figurative context: cf. tide, n. 9.
Rising in waves, or as a wave; rising in level, becoming fuller, as a river or the tide. Chiefly poetic.
Of a body of water: cf. swell, v. 1b 2b 3b.